Examples with MoveDecision org.elasticsearch.cluster.routing.allocation.MoveDecision used on opensource projects

Example 6 with MoveDecision

use of org.elasticsearch.cluster.routing.allocation.MoveDecision in project elasticsearch by elastic.

the class ClusterAllocationExplainIT method testAllocationFilteringPreventsShardMove.

public void testAllocationFilteringPreventsShardMove() throws Exception {
    logger.info("--> starting 2 nodes");
    internalCluster().startNodes(2);
    logger.info("--> creating an index with 1 primary and 0 replicas");
    createIndexAndIndexData(1, 0);
    logger.info("--> setting up allocation filtering to prevent allocation to both nodes");
    client().admin().indices().prepareUpdateSettings("idx").setSettings(Settings.builder().put("index.routing.allocation.include._name", "non_existent_node")).get();
    boolean includeYesDecisions = randomBoolean();
    boolean includeDiskInfo = randomBoolean();
    ClusterAllocationExplanation explanation = runExplain(true, includeYesDecisions, includeDiskInfo);
    ShardId shardId = explanation.getShard();
    boolean isPrimary = explanation.isPrimary();
    ShardRoutingState shardRoutingState = explanation.getShardState();
    DiscoveryNode currentNode = explanation.getCurrentNode();
    UnassignedInfo unassignedInfo = explanation.getUnassignedInfo();
    ClusterInfo clusterInfo = explanation.getClusterInfo();
    AllocateUnassignedDecision allocateDecision = explanation.getShardAllocationDecision().getAllocateDecision();
    MoveDecision moveDecision = explanation.getShardAllocationDecision().getMoveDecision();
    // verify shard info
    assertEquals("idx", shardId.getIndexName());
    assertEquals(0, shardId.getId());
    assertTrue(isPrimary);
    // verify current node info
    assertEquals(ShardRoutingState.STARTED, shardRoutingState);
    assertNotNull(currentNode);
    // verify unassigned info
    assertNull(unassignedInfo);
    // verify cluster info
    verifyClusterInfo(clusterInfo, includeDiskInfo, 2);
    // verify decision object
    assertFalse(allocateDecision.isDecisionTaken());
    assertTrue(moveDecision.isDecisionTaken());
    assertEquals(AllocationDecision.NO, moveDecision.getAllocationDecision());
    assertEquals("cannot move shard to another node, even though it is not allowed to remain on its current node", moveDecision.getExplanation());
    assertFalse(moveDecision.canRemain());
    assertFalse(moveDecision.forceMove());
    assertFalse(moveDecision.canRebalanceCluster());
    assertNull(moveDecision.getClusterRebalanceDecision());
    assertNull(moveDecision.getTargetNode());
    assertEquals(0, moveDecision.getCurrentNodeRanking());
    // verifying can remain decision object
    assertNotNull(moveDecision.getCanRemainDecision());
    assertEquals(Decision.Type.NO, moveDecision.getCanRemainDecision().type());
    for (Decision d : moveDecision.getCanRemainDecision().getDecisions()) {
        if (d.label().equals("filter")) {
            assertEquals(Decision.Type.NO, d.type());
            assertEquals("node does not match index setting [index.routing.allocation.include] filters [_name:\"non_existent_node\"]", d.getExplanation());
        } else {
            assertEquals(Decision.Type.YES, d.type());
            assertNotNull(d.getExplanation());
        }
    }
    // verify node decisions
    assertEquals(1, moveDecision.getNodeDecisions().size());
    NodeAllocationResult result = moveDecision.getNodeDecisions().get(0);
    assertNotNull(result.getNode());
    assertEquals(1, result.getWeightRanking());
    assertEquals(AllocationDecision.NO, result.getNodeDecision());
    if (includeYesDecisions) {
        assertThat(result.getCanAllocateDecision().getDecisions().size(), greaterThan(1));
    } else {
        assertEquals(1, result.getCanAllocateDecision().getDecisions().size());
    }
    for (Decision d : result.getCanAllocateDecision().getDecisions()) {
        if (d.label().equals("filter")) {
            assertEquals(Decision.Type.NO, d.type());
            assertEquals("node does not match index setting [index.routing.allocation.include] filters [_name:\"non_existent_node\"]", d.getExplanation());
        } else {
            assertEquals(Decision.Type.YES, d.type());
            assertNotNull(d.getExplanation());
        }
    }
    // verify JSON output
    try (XContentParser parser = getParser(explanation)) {
        verifyShardInfo(parser, true, includeDiskInfo, ShardRoutingState.STARTED);
        parser.nextToken();
        assertEquals("can_remain_on_current_node", parser.currentName());
        parser.nextToken();
        assertEquals(AllocationDecision.NO.toString(), parser.text());
        parser.nextToken();
        assertEquals("can_remain_decisions", parser.currentName());
        verifyDeciders(parser, AllocationDecision.NO);
        parser.nextToken();
        assertEquals("can_move_to_other_node", parser.currentName());
        parser.nextToken();
        assertEquals(AllocationDecision.NO.toString(), parser.text());
        parser.nextToken();
        assertEquals("move_explanation", parser.currentName());
        parser.nextToken();
        assertEquals("cannot move shard to another node, even though it is not allowed to remain on its current node", parser.text());
        verifyNodeDecisions(parser, allNodeDecisions(AllocationDecision.NO, true), includeYesDecisions, false);
        assertEquals(Token.END_OBJECT, parser.nextToken());
    }
}

Example 7 with MoveDecision

use of org.elasticsearch.cluster.routing.allocation.MoveDecision in project elasticsearch by elastic.

the class BalancedShardsAllocator method decideShardAllocation.

@Override
public ShardAllocationDecision decideShardAllocation(final ShardRouting shard, final RoutingAllocation allocation) {
    Balancer balancer = new Balancer(logger, allocation, weightFunction, threshold);
    AllocateUnassignedDecision allocateUnassignedDecision = AllocateUnassignedDecision.NOT_TAKEN;
    MoveDecision moveDecision = MoveDecision.NOT_TAKEN;
    if (shard.unassigned()) {
        allocateUnassignedDecision = balancer.decideAllocateUnassigned(shard, Sets.newHashSet());
    } else {
        moveDecision = balancer.decideMove(shard);
        if (moveDecision.isDecisionTaken() && moveDecision.canRemain()) {
            MoveDecision rebalanceDecision = balancer.decideRebalance(shard);
            moveDecision = rebalanceDecision.withRemainDecision(moveDecision.getCanRemainDecision());
        }
    }
    return new ShardAllocationDecision(allocateUnassignedDecision, moveDecision);
}

Example 8 with MoveDecision

use of org.elasticsearch.cluster.routing.allocation.MoveDecision in project elasticsearch by elastic.

the class ClusterAllocationExplainIT method testAllocationFilteringOnIndexCreation.

public void testAllocationFilteringOnIndexCreation() throws Exception {
    logger.info("--> starting 2 nodes");
    internalCluster().startNodes(2);
    logger.info("--> creating an index with 1 primary, 0 replicas, with allocation filtering so the primary can't be assigned");
    createIndexAndIndexData(1, 0, Settings.builder().put("index.routing.allocation.include._name", "non_existent_node").build(), ActiveShardCount.NONE);
    boolean includeYesDecisions = randomBoolean();
    boolean includeDiskInfo = randomBoolean();
    ClusterAllocationExplanation explanation = runExplain(true, includeYesDecisions, includeDiskInfo);
    ShardId shardId = explanation.getShard();
    boolean isPrimary = explanation.isPrimary();
    ShardRoutingState shardRoutingState = explanation.getShardState();
    DiscoveryNode currentNode = explanation.getCurrentNode();
    UnassignedInfo unassignedInfo = explanation.getUnassignedInfo();
    ClusterInfo clusterInfo = explanation.getClusterInfo();
    AllocateUnassignedDecision allocateDecision = explanation.getShardAllocationDecision().getAllocateDecision();
    MoveDecision moveDecision = explanation.getShardAllocationDecision().getMoveDecision();
    // verify shard info
    assertEquals("idx", shardId.getIndexName());
    assertEquals(0, shardId.getId());
    assertTrue(isPrimary);
    // verify current node info
    assertNotEquals(ShardRoutingState.STARTED, shardRoutingState);
    assertNull(currentNode);
    // verify unassigned info
    assertNotNull(unassignedInfo);
    assertEquals(Reason.INDEX_CREATED, unassignedInfo.getReason());
    assertEquals(AllocationStatus.DECIDERS_NO, unassignedInfo.getLastAllocationStatus());
    // verify cluster info
    verifyClusterInfo(clusterInfo, includeDiskInfo, 2);
    // verify decision objects
    assertTrue(allocateDecision.isDecisionTaken());
    assertFalse(moveDecision.isDecisionTaken());
    assertEquals(AllocationDecision.NO, allocateDecision.getAllocationDecision());
    assertEquals("cannot allocate because allocation is not permitted to any of the nodes", allocateDecision.getExplanation());
    assertNull(allocateDecision.getAllocationId());
    assertNull(allocateDecision.getTargetNode());
    assertEquals(0L, allocateDecision.getConfiguredDelayInMillis());
    assertEquals(0L, allocateDecision.getRemainingDelayInMillis());
    assertEquals(2, allocateDecision.getNodeDecisions().size());
    for (NodeAllocationResult result : allocateDecision.getNodeDecisions()) {
        assertNotNull(result.getNode());
        assertEquals(AllocationDecision.NO, result.getNodeDecision());
        if (includeYesDecisions) {
            assertThat(result.getCanAllocateDecision().getDecisions().size(), greaterThan(1));
        } else {
            assertEquals(1, result.getCanAllocateDecision().getDecisions().size());
        }
        for (Decision d : result.getCanAllocateDecision().getDecisions()) {
            if (d.label().equals("filter")) {
                assertEquals(Decision.Type.NO, d.type());
                assertEquals("node does not match index setting [index.routing.allocation.include] filters " + "[_name:\"non_existent_node\"]", d.getExplanation());
            }
        }
    }
    // verify JSON output
    try (XContentParser parser = getParser(explanation)) {
        verifyShardInfo(parser, true, includeDiskInfo, ShardRoutingState.UNASSIGNED);
        parser.nextToken();
        assertEquals("can_allocate", parser.currentName());
        parser.nextToken();
        String allocationDecision = parser.text();
        assertTrue(allocationDecision.equals(AllocationDecision.NO.toString()) || allocationDecision.equals(AllocationDecision.AWAITING_INFO.toString()));
        parser.nextToken();
        assertEquals("allocate_explanation", parser.currentName());
        parser.nextToken();
        if (allocationDecision.equals("awaiting_info")) {
            assertEquals("cannot allocate because information about existing shard data is still being retrieved " + "from some of the nodes", parser.text());
        } else {
            assertEquals("cannot allocate because allocation is not permitted to any of the nodes", parser.text());
        }
        Map<String, AllocationDecision> nodeDecisions = new HashMap<>();
        for (String nodeName : internalCluster().getNodeNames()) {
            nodeDecisions.put(nodeName, AllocationDecision.NO);
        }
        verifyNodeDecisions(parser, nodeDecisions, includeYesDecisions, false);
        assertEquals(Token.END_OBJECT, parser.nextToken());
    }
}

Example 9 with MoveDecision

use of org.elasticsearch.cluster.routing.allocation.MoveDecision in project elasticsearch by elastic.

the class ClusterAllocationExplainIT method testUnassignedPrimaryWithExistingIndex.

public void testUnassignedPrimaryWithExistingIndex() throws Exception {
    logger.info("--> starting 2 nodes");
    internalCluster().startNodes(2);
    logger.info("--> creating an index with 1 primary, 0 replicas");
    createIndexAndIndexData(1, 0);
    logger.info("--> stopping the node with the primary");
    internalCluster().stopRandomNode(InternalTestCluster.nameFilter(primaryNodeName()));
    ensureStableCluster(1);
    boolean includeYesDecisions = randomBoolean();
    boolean includeDiskInfo = randomBoolean();
    ClusterAllocationExplanation explanation = runExplain(true, includeYesDecisions, includeDiskInfo);
    ShardId shardId = explanation.getShard();
    boolean isPrimary = explanation.isPrimary();
    ShardRoutingState shardState = explanation.getShardState();
    DiscoveryNode currentNode = explanation.getCurrentNode();
    UnassignedInfo unassignedInfo = explanation.getUnassignedInfo();
    ClusterInfo clusterInfo = explanation.getClusterInfo();
    AllocateUnassignedDecision allocateDecision = explanation.getShardAllocationDecision().getAllocateDecision();
    MoveDecision moveDecision = explanation.getShardAllocationDecision().getMoveDecision();
    // verify shard info
    assertEquals("idx", shardId.getIndexName());
    assertEquals(0, shardId.getId());
    assertTrue(isPrimary);
    // verify current node info
    assertNotEquals(ShardRoutingState.STARTED, shardState);
    assertNull(currentNode);
    // verify unassigned info
    assertNotNull(unassignedInfo);
    assertEquals(Reason.NODE_LEFT, unassignedInfo.getReason());
    assertTrue(unassignedInfo.getLastAllocationStatus() == AllocationStatus.FETCHING_SHARD_DATA || unassignedInfo.getLastAllocationStatus() == AllocationStatus.NO_VALID_SHARD_COPY);
    // verify cluster info
    verifyClusterInfo(clusterInfo, includeDiskInfo, 1);
    // verify decision objects
    assertTrue(allocateDecision.isDecisionTaken());
    assertFalse(moveDecision.isDecisionTaken());
    assertTrue(allocateDecision.getAllocationDecision() == AllocationDecision.NO_VALID_SHARD_COPY || allocateDecision.getAllocationDecision() == AllocationDecision.AWAITING_INFO);
    if (allocateDecision.getAllocationDecision() == AllocationDecision.NO_VALID_SHARD_COPY) {
        assertEquals("cannot allocate because a previous copy of the primary shard existed but can no longer be " + "found on the nodes in the cluster", allocateDecision.getExplanation());
    } else {
        assertEquals("cannot allocate because information about existing shard data is still being retrieved from some of the nodes", allocateDecision.getExplanation());
    }
    assertNull(allocateDecision.getAllocationId());
    assertNull(allocateDecision.getTargetNode());
    assertEquals(0L, allocateDecision.getConfiguredDelayInMillis());
    assertEquals(0L, allocateDecision.getRemainingDelayInMillis());
    if (allocateDecision.getAllocationDecision() == AllocationDecision.NO_VALID_SHARD_COPY) {
        assertEquals(1, allocateDecision.getNodeDecisions().size());
        // verify JSON output
        try (XContentParser parser = getParser(explanation)) {
            verifyShardInfo(parser, true, includeDiskInfo, ShardRoutingState.UNASSIGNED);
            parser.nextToken();
            assertEquals("can_allocate", parser.currentName());
            parser.nextToken();
            assertEquals(AllocationDecision.NO_VALID_SHARD_COPY.toString(), parser.text());
            parser.nextToken();
            assertEquals("allocate_explanation", parser.currentName());
            parser.nextToken();
            assertEquals("cannot allocate because a previous copy of the primary shard existed but can no longer be found " + "on the nodes in the cluster", parser.text());
            verifyStaleShardCopyNodeDecisions(parser, 1, Collections.emptySet());
        }
    }
}

Example 10 with MoveDecision

use of org.elasticsearch.cluster.routing.allocation.MoveDecision in project elasticsearch by elastic.

the class ClusterAllocationExplainIT method testWorseBalance.

public void testWorseBalance() throws Exception {
    logger.info("--> starting a single node");
    internalCluster().startNode();
    ensureStableCluster(1);
    logger.info("--> creating an index with 5 shards, all allocated to the single node");
    createIndexAndIndexData(5, 0);
    logger.info("--> setting balancing threshold really high, so it won't be met");
    client().admin().cluster().prepareUpdateSettings().setTransientSettings(Settings.builder().put("cluster.routing.allocation.balance.threshold", 1000.0f)).get();
    logger.info("--> starting another node, with the rebalance threshold so high, it should not get any shards");
    internalCluster().startNode();
    ensureStableCluster(2);
    boolean includeYesDecisions = randomBoolean();
    boolean includeDiskInfo = randomBoolean();
    ClusterAllocationExplanation explanation = runExplain(true, includeYesDecisions, includeDiskInfo);
    ShardId shardId = explanation.getShard();
    boolean isPrimary = explanation.isPrimary();
    ShardRoutingState shardRoutingState = explanation.getShardState();
    DiscoveryNode currentNode = explanation.getCurrentNode();
    UnassignedInfo unassignedInfo = explanation.getUnassignedInfo();
    ClusterInfo clusterInfo = explanation.getClusterInfo();
    AllocateUnassignedDecision allocateDecision = explanation.getShardAllocationDecision().getAllocateDecision();
    MoveDecision moveDecision = explanation.getShardAllocationDecision().getMoveDecision();
    // verify shard info
    assertEquals("idx", shardId.getIndexName());
    assertEquals(0, shardId.getId());
    assertTrue(isPrimary);
    // verify current node info
    assertEquals(ShardRoutingState.STARTED, shardRoutingState);
    assertNotNull(currentNode);
    // verify unassigned info
    assertNull(unassignedInfo);
    // verify cluster info
    verifyClusterInfo(clusterInfo, includeDiskInfo, 2);
    // verify decision object
    assertFalse(allocateDecision.isDecisionTaken());
    assertTrue(moveDecision.isDecisionTaken());
    assertEquals(AllocationDecision.NO, moveDecision.getAllocationDecision());
    assertEquals("cannot rebalance as no target node exists that can both allocate this shard and improve the cluster balance", moveDecision.getExplanation());
    assertTrue(moveDecision.canRemain());
    assertFalse(moveDecision.forceMove());
    assertTrue(moveDecision.canRebalanceCluster());
    assertNotNull(moveDecision.getCanRemainDecision());
    assertNull(moveDecision.getTargetNode());
    assertEquals(1, moveDecision.getCurrentNodeRanking());
    // verifying cluster rebalance decision object
    assertNotNull(moveDecision.getClusterRebalanceDecision());
    assertEquals(Decision.Type.YES, moveDecision.getClusterRebalanceDecision().type());
    for (Decision d : moveDecision.getClusterRebalanceDecision().getDecisions()) {
        assertEquals(Decision.Type.YES, d.type());
        assertNotNull(d.getExplanation());
    }
    // verify node decisions
    assertEquals(1, moveDecision.getNodeDecisions().size());
    NodeAllocationResult result = moveDecision.getNodeDecisions().get(0);
    assertNotNull(result.getNode());
    assertEquals(1, result.getWeightRanking());
    assertEquals(AllocationDecision.WORSE_BALANCE, result.getNodeDecision());
    if (includeYesDecisions) {
        assertThat(result.getCanAllocateDecision().getDecisions().size(), greaterThan(0));
    } else {
        assertEquals(0, result.getCanAllocateDecision().getDecisions().size());
    }
    for (Decision d : result.getCanAllocateDecision().getDecisions()) {
        assertEquals(Decision.Type.YES, d.type());
        assertNotNull(d.getExplanation());
    }
    // verify JSON output
    try (XContentParser parser = getParser(explanation)) {
        verifyShardInfo(parser, true, includeDiskInfo, ShardRoutingState.STARTED);
        parser.nextToken();
        assertEquals("can_remain_on_current_node", parser.currentName());
        parser.nextToken();
        assertEquals(AllocationDecision.YES.toString(), parser.text());
        parser.nextToken();
        assertEquals("can_rebalance_cluster", parser.currentName());
        parser.nextToken();
        assertEquals(AllocationDecision.YES.toString(), parser.text());
        parser.nextToken();
        assertEquals("can_rebalance_to_other_node", parser.currentName());
        parser.nextToken();
        assertEquals(AllocationDecision.NO.toString(), parser.text());
        parser.nextToken();
        assertEquals("rebalance_explanation", parser.currentName());
        parser.nextToken();
        assertEquals("cannot rebalance as no target node exists that can both allocate this shard and improve the cluster balance", parser.text());
        verifyNodeDecisions(parser, allNodeDecisions(AllocationDecision.WORSE_BALANCE, true), includeYesDecisions, false);
        assertEquals(Token.END_OBJECT, parser.nextToken());
    }
}